89 lines
3.0 KiB
PHP
89 lines
3.0 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Validator\Mapping\Loader;
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use Symfony\Component\Validator\Constraint;
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use Symfony\Component\Validator\Exception\MappingException;
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/**
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* Base loader for validation metadata.
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*
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* This loader supports the loading of constraints from Symfony's default
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* namespace (see {@link DEFAULT_NAMESPACE}) using the short class names of
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* those constraints. Constraints can also be loaded using their fully
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* qualified class names. At last, namespace aliases can be defined to load
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* constraints with the syntax "alias:ShortName".
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*
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* @author Bernhard Schussek <bschussek@gmail.com>
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*/
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abstract class AbstractLoader implements LoaderInterface
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{
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/**
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* The namespace to load constraints from by default.
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*/
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const DEFAULT_NAMESPACE = '\\Symfony\\Component\\Validator\\Constraints\\';
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protected $namespaces = array();
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/**
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* Adds a namespace alias.
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*
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* The namespace alias can be used to reference constraints from specific
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* namespaces in {@link newConstraint()}:
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*
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* $this->addNamespaceAlias('mynamespace', '\\Acme\\Package\\Constraints\\');
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*
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* $constraint = $this->newConstraint('mynamespace:NotNull');
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*
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* @param string $alias The alias
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* @param string $namespace The PHP namespace
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*/
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protected function addNamespaceAlias($alias, $namespace)
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{
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$this->namespaces[$alias] = $namespace;
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}
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/**
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* Creates a new constraint instance for the given constraint name.
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*
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* @param string $name The constraint name. Either a constraint relative
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* to the default constraint namespace, or a fully
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* qualified class name. Alternatively, the constraint
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* may be preceded by a namespace alias and a colon.
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* The namespace alias must have been defined using
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* {@link addNamespaceAlias()}.
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* @param mixed $options The constraint options
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*
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* @return Constraint
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*
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* @throws MappingException If the namespace prefix is undefined
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*/
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protected function newConstraint($name, $options = null)
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{
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if (false !== strpos($name, '\\') && class_exists($name)) {
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$className = (string) $name;
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} elseif (false !== strpos($name, ':')) {
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list($prefix, $className) = explode(':', $name, 2);
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if (!isset($this->namespaces[$prefix])) {
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throw new MappingException(sprintf('Undefined namespace prefix "%s"', $prefix));
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}
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$className = $this->namespaces[$prefix].$className;
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} else {
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$className = self::DEFAULT_NAMESPACE.$name;
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}
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return new $className($options);
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}
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}
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